Canon multipass c3000 Service Manual (en)

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b) G3 Reception
(1) Image signals received by L1, L2, pass through the hybrid circuit in the NCU, and are
amplified.  The modem demodulate these images, and writes them to the DRAM.  
(2) The MPU decodes the demodulate image data, checks errors, stores them in the DRAM,
encodes the data and rewrites them into the DRAM.
(3) The system controller IC converts the decoded data from run-length data to raw data,
and converts 8 dot/mm fax data into 360 dpi resolution converted printer data, and
writes them to the DRAM.
(4) The system controller IC converts the resolution converted printer data to BJ printer
head control signals, and then sends the signals to the BJ print head, via the BJ
controller IC.  Simultaneously, the printer MPU sends motor control signals to the
carriage motor and line feed motor, via the driver IC.
Part 1: Facsimile
2-32
SCNT board
d
a
c
b
a     MODEM IC
b     DRAM
c     MPU
d     System controller IC
e     BJ controller IC
f      MPU(Printer)
g     Driver IC(Carriage motor)
h     Driver IC(Paper feed motor)
(3)
Paper feed motor
Carriage motor
b
(1)
(1)
(2)
(2)
(4)
(1)
(4)
(4)
(4)
(4)
NCU
board
(1)
g
e
h
f
PCNT board
Figure 2-23 G3 Reception Image Signal Flow